Две функции работают по отдельности, когда вместе выскакивает ошибка

public:     // User declarations
 
        BEGIN_MESSAGE_MAP
        MESSAGE_HANDLER(WM_DEVICECHANGE,TMessage,WMDropFiles)
        END_MESSAGE_MAP(TForm);
 
        BEGIN_MESSAGE_MAP
        MESSAGE_HANDLER (WM_DEVICECHANGE, TMessage, OnDeviceChange);
        END_MESSAGE_MAP (TComponent)

[BCC32 Error] Unit1.h(320): E2238 Multiple declaration for '_fastcall TForm1::Dispatch(void *)'
[BCC32 Error] Unit1.h(316): E2344 Earlier declaration of '_fastcall TForm1::Dispatch(void *)'

BEGIN_MESSAGE_MAP
  MESSAGE_HANDLER(WM_DEVICECHANGE,TMessage,WMDropFiles)
  MESSAGE_HANDLER(WM_DEVICECHANGE,TMessage,OnDeviceChange)
END_MESSAGE_MAP (TForm)

        BEGIN_MESSAGE_MAP      // для мемо
        MESSAGE_HANDLER (WM_DEVICECHANGE, TMessage, OnDeviceChange);
        END_MESSAGE_MAP (TComponent)

AnsiString PrepPath(AnsiString path);
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//===========================================================================
 // здесь использую
void TForm1 :: OnDeviceChange(TMessage& Msg)
{
    if (Msg.WParam == DBT_DEVICEARRIVAL)
    {
    LogMemo->Lines->Add("конфигурация изменена");
    }
}
//===========================================================================

    BEGIN_MESSAGE_MAP
        MESSAGE_HANDLER(WM_DEVICECHANGE,TMessage,WMDropFiles)
        END_MESSAGE_MAP(TForm);